c - valgrind error in ioctl() call, while sending an i2c message -


valgrind giving me following error on ioctl() line: not sure how avert such error.

==2764== error summary: 1 errors 1 contexts (suppressed: 0 0)
==2764==
==2764== 1 errors in context 1 of 1:
==2764== syscall param ioctl(i2c_rdwr).msgs points uninitialised byte(s)
==2764== @ 0x4e08efec: ioctl (syscall-template.s:81)
==2764== 0x871f: imxsend_i2cmsg (imx6qi2c_wrapper.c:54)
==2764== 0x87cb: imxsend_i2cbyte (imx6qi2c_wrapper.c:84)
==2764== 0x86d3: main (imx6qi2c_test.c:30)
==2764== address 0x7db99b82 on thread 1's stack
==2764== uninitialised value created stack allocation
==2764== @ 0x875c: imxsend_i2cbyte (imx6qi2c_wrapper.c:66)

the code in imx6qi2c_wrapper.c following:

int imxsend_i2cmsg(const int i2c_fd,                    struct i2c_msg *i2cmsgarray,                             const unsigned int arraysize){     int ret=0;     struct i2c_rdwr_ioctl_data ioctl_pack;      ioctl_pack.nmsgs=arraysize;     ioctl_pack.msgs=i2cmsgarray;      ret=ioctl(i2c_fd,i2c_rdwr,&ioctl_pack);      return ret; }

and "i2cmsgarray" declared in annother function locally. 

int imxsend_i2cbyte(const int i2c_fd,                       const unsigned char i2caddress,                       const unsigned char devregister,                       const unsigned char value){     struct i2c_msg i2cmsg[i2cmsgs_total_wr];     int ret=0,i=0;      (i=0;i<i2cmsgs_total_wr;i++){         i2cmsg[i].buf=malloc(2*sizeof(char));     }       i2cmsg[0].addr=i2caddress;     i2cmsg[0].flags=i2c_m_wr;     i2cmsg[0].len=2;     i2cmsg[0].buf[0]=devregister;     i2cmsg[0].buf[1]=value;      ret=imxsend_i2cmsg(i2c_fd,&i2cmsg[0],i2cmsgs_total_wr);     if (ret<0){         printf("i2cmsg failed.errno %d, %s\n",errno,strerror(errno));     }       (i=0;i<i2cmsgs_total_wr;i++){         free(i2cmsg[i].buf);     }     return ret; }

where uninitialized byte?

ok completion copy here answer given comment (but never posted answer user knew answer).

memset 0 on i2cmsg solve problem

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